Brake



March 119 1929. 's SANFORD 3,705,737

BRAKE Filed Aug. 5, 1925 INVENTOR RoY 5. SANFORD ATTORNEY Patented Mar. 19, 1929.

UNITED STATES PATENT, OFFICE.

noY s. sANroRn, or SOUTH BEND, INDIANA, ASSIGNOR To BENDIX' BRAKE COMPANY,

' or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

BRAKE.

Application filed August 3,1925. Serial No. 47,666.

This invention relates to brakes, and is illustrated as embodied in an internal expanding automobile brake. An objectof the invention is to provide a brake having a pair of shoes connected at opposite ends of a central shoe, and which is of the duo-servo or double-wrapping type, by providing novel anchoring means taking the torque of all three shoes from one end shoe when the drum is turning in one direction and from the other end shoe when the drum is turning 1n the op: posite direction. The various features of novelty will be apparent from the following description of one illustrative embodiment shown in the accompanying drawing, in which:

The figure is a vertical section through the brake just inside the Wheel, showing the shoes in side elevation.

In this particular embodiment, the shoes are substantially inclosed by the drum 10 and the backing plate 12. A symmetrical central shoe 14 has pivoted thereto at 16 and 18, some distance from its ends, a pair of end shoes 20 and 22, each of which is forked at its ends to form a 'pair of arms straddling the end of shoe 14, so that shoe 14 overhangs both connections. tially as more fully described in Patent No. 1,640,589, granted Bendix Brake Company on Aug. 30, 1927.

Shoes 20 and 22 are forced apart to apply the brake, against the,resistance of a return spring 24, by an expanding device such as a floating double cam 26. The cam may be arranged substantially as more fully described in Patent No. 1,642,844, granted Bendix Brake Company on September 20, 1927 Auxiliary springs 28 act on the connected ends of shoe 14 to urge the shoe against one or more eccentric adjustable stops 30.

I one or the other of the shoes 20 or 22, a'cco'rding to the direction of rotation of drum 10,

. The torque is taken for all three shoes from either by a pair of links 32 or by apair of links 34. The links are inclined in opposite directions to cross each other, and have slots 36 embracing the anchor pins 38, so that the idle pair of links may have the, necessary lost motion.

This construction may besubstan- While one illustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1. A brake comprising, in combination, a drum, a floating friction device within the drum including pivotally-connected shoes, a stop engaging the. central shoe approximately at its center when the brake is released, and a pair of springs connected to opposite ends of said central shoe and urging ittoward said stop.

2. A brake comprising, in combination, a drum, a floating friction device within the drum including pivotally-connected shoes, 0. normally-stationary but adjustable device within the drum serving as a stop engaging the central shoe approximately at its center when the brake is released, and a pair of springs connected to opposite ends of said central shoe and urging it toward said stop.

3, A brake comprising, in combinatioma drum, a floating friction device Within the drum having adjacent ends, a linkconnected of the drum and inclined to terminate at a point just inside the otherv of said ends, the two links crossing each other, and a stationary anchor-part engaging the inner end of each link, the connection at one end of each link including a slot permitting said end of the friction device to move away from its anchor part.

In testimony whereof I have hereunto signed my name.

ROY SANFORD. 

